一年级数学20以内破十法减法练习题.doc

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20以内破十法减法练习题凑十法儿歌一九一九好朋友，二八二八手拉手。三七三七真亲密，四六四六一起走，五五凑成一双手。看大数，分小数，凑成十，加剩数。大数记心里，小数记手里 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 13 — 7 = 12 — 7 = 11 — 7 = 15 — 6 = 14 — 6 = 13 — 6 = 12 — 6 = 11 — 6 = 14 — 5 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 12 — 3 = 11 — 3 = 11 — 2 = 13 — 5 = 12 — 5 = 11 — 5 = 13 — 8 = 12 — 8 = 11 — 8 = 16 — 7 = 15 — 7 = 14 — 7 = 12 — 6 = 11 — 6 = 14 — 5 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 4 = 12 — 4 = 11 — 4 = 16 — 7 = 15 — 7 = 14 — 7 = 18 — 9 = 17 — 9 = 16 — 9 = 15 — 9 = 14 — 9 = 13 — 9 = 13 — 7 = 12 — 7 = 11 — 7 = 12 — 9 = 11 — 9 = 17 — 8 = 16 — 8 = 15 — 8 = 14 — 8 = 例子： 9 + 9 = 9 + 8 = 9 + 7 = 巩固练习： 7 + 9 = 7 + 8 = 7 + 7 = 9 + 9 = 9 + 8 = 9 + 7 = 【重点知识二】破十法：退位减法使用破十法口诀：看大数，分出10，减小数，加剩数例子： 18 – 9 = 17 – 9 = 16 – 9 = 15 – 9 = 巩固练习： 17 – 8 = 16 – 8 = 15 – 8 = 14 – 8 = 13 – 8 = 12 – 8 = 11 – 8 = 16 – 7 = 提升练习题一、口算 12– 6 = 11 – 6 = 14 – 5 = 13 – 5 = 6 + 9 = 6 + 8 = 6 + 7 = 15– 6 = 12 – 6 = 12 – 5 = 17 – 9 = 13– 4= 11 – 5 = 14 – 6 = 16 – 8= 15– 9= 18 – 9= 12 – 7= 14 – 9= 13– 7 = 12 – 9 = 11 – 3 = 12 – 5 = 13– 7 = 12 – 9 = 11 – 3 = 12 – 5 = 16– 9 = 15 – 8 = 13 – 8= 11 – 6 = 13– 7 = 12 – 9 = 11 – 3 = 12 – 5 = 17

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